This Battery Charger Electronic circuit Project An
LM317 voltage regulator is configured as a constant-current source. It
is used to supply the 50 mA charging current to S01-S06, an array of
AA-cell battery holders. Each of the battery holders is wired in series
with an LED and its associated shunt resistor.
Battery charger using LM317 Circuit Diagram:
When
the battery holder contains a battery, the LED glows during charging.
Each battery holder/LED combination is paralleled by a 5.1-volt Zener
diode. If the battery holder is empty, the Zener conducts the current
around the holder.
A
timing circuit prevents overcharging. When power is applied to the
circuit, timing is initiated by IC2, a CD4541 oscillator/programmable
timer. The output of IC2 is fed to Ql. When that output is high, the
transistor is on, and the charging circuit is completed. When the output
is low, the transistor is off, and the path to ground is interrupted.
No comments:
Post a Comment